I am considering taking my phone to a different carrier partner/virtual network operator, but I discovered at least one carrier doesn't offer BIS. Without internet service, many apps won't work (including navigation).

I normally use that list as a good resource for BB supporting carriers. I've learned that it's not necessarily exhaustive, but it might be a good place for you to start.

Do, however, keep in mind these factors:

Your BB must be specifically capable of working with the frequencies/technologies that the carrier uses...you must review the capabilities of the device against what the carrier uses (you might have to ask them that question)

If your BB is not natively supported by the carrier network for automatic HRT population and Service Book distribution, then it may be very challenging to get your BB to function on that carriers network. You would need to ask them this specific question as well (though the above linked resource could also provide you with indicators...if a carrier lists your model, then their network supports it).

Your BB must be MEP unlocked in order to use it on any carrier other than that for which it was originally manufactured.

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